Agitator for spreader stoker feeders



Dec. 11, 1951 WAGNER 2,578,161

AGITATOR FOR SPREADER STOKER FEEDERS Filed Oct. 11, 1948 2 SHEETSSHEET lB ATTU/P/VEYS Dec. '11, 1951 H. L. WAGNER 2,578,161

AGITATOR FOR SPREADER STOKER FEEDERS Filed Oct. 11, 1948 2 SHEETSSHEET2,

IN I "EN TOR. HfRBE/iTL. WAGNER Patented Dec. 11, 195

AGITATOR FOR SPREADER STOKER FEEDERS Herbert Leonard Wagner, Detroit,Mich., assignor to Detroit Stoker Company, Monroe, Mich., a

3 Claims.

The invention relates to stokers of the sprinkler type in which the fuelis thrown by a rotary impeller into the furnace chamber to be depositedover the fuel bed on the grate therein. More particularly, the inventionrelates to sprinkler stokers of the type disclosed in Patent No.2,004,363 to R. L. Beers, issued June 16, 1935. In this construction thefuel from a hopper is fed by a reciprocatory ram over a spill plate, andis dropped therefrom into the path of the rotary impeller. The forwardedge of this spill plate is adjusted into predetermined relation to thevertical plane of the impeller axis, so that fuel dropping over thisedge will contact with the impeller blades when at a predeterminedangle. This determines the trajectory of the fuel hurled by the blades,and is important to the proper distribution of the fuel over the grate.

One difilculty which has been encountered in the operation of suchstokers is that Where the fuel is relatively fine and in a moistcondition it has a tendency to pack and form a coherent mass.Consequently, when advanced by the ram it may be projected beyond theedge of the spill plate a considerable distance before breaking off andfalling. Thus the angle of the blade when contacting the fuel is not thesame as is the case where the plane of falling is adjacent to the edgeof the spill plate, which results in unsatisfactory distribution of thefuel.

It is the object of the invention to overcome this defeat, and to thisend the invention consists in the construction as hereinafter set forth.

In the drawings:

Fig. 1 is a vertical longitudinal section through my improved structure;

Fig. 2 is a cross-section substantially on line 2-2, Fig. 1;

Fig. 3 is a side elevation.

A is the rotary impeller, which is mounted upon a shaft B to rotatewithin a segmental cylindrical housing C having an open segment incommunication with an opening D into the furnace. The fuel is suppliedfrom a hopper E and rests therein upon a bottom plate or shelf F, whichlatter extends over the housing C and constitutes a spill plate. G is aram resting upon the shelf F and reciprocated by suitable means, such asa rock shaft H and an upwardly extending rock arm I pivotally engagingthe ram. The

rock shaft H is actuated by an external rock arm K which, in turn, isactuted by a rod L engaging an eccentric L on a shaft M. The shaft isdriven from the shaft B by a suitable step down gearing (not shown) andduring each revolution corporation of Michigan I v Application October11, 1948, Serial No. 53,934

- plate.

effects a complete reciprocation of the ram. Fuel is pushed oil. fromthe spill plate during each forward movement of the ram and if free willfall in a plane adjacent thereto. However, as above described, the fuelmay be in a packed condition where instead of falling immediately itwill be projected for a considerable distance beyond the edge of thespill plate before breaking off.

With my improved construction I provide means for breaking the cohesionbetween the portion of the fuel directly above and supported upon thespill plate, and that portion which is projected beyond the forward edgeof the spill This permits the fuel to freely fall in a plane which isdetermined by the adjustment of the spill plate. As specificallyillustrated, the means for accomplishing this preferably comprises a rodN extending across the stoker slightly in advance of the forward edge ofthe plate, which rod has connected at its opposite ends upwardlyextending arms N' passing through apertures O in the top plate 0'. Theupper ends of the arms N are pivotally connected to rock arms P upon arock shaft P, which shaft has an actuating rock arm P connected by a rodQ to a crank pin Q on the eccentric L. The arrangement is such that eachrotation of the eccentric L will rock the shaft P' and cause a verticalreciprocation of the arms N and rod N. The movement of the rod is alsotimed with the movement of the ram, so that during the forward movementof the ram the rod N will be pressed downward against any portion of thefuel projecting beyond the forward edge of the spill plate therebyfreeing this portion from the portion following.

The stoker is preferably provided with means for adjusting the amplitudeof movement of the ram which, as specifically illustrated and as shownin my prior Patent No. 2,004,363, prises a pin L on the outer end of therock arm L, which engages an arcuate slot K in the rock arm K to beadjustable in said slot towards or from the shaft H. A link R connectsthe pin L with a lever S, which may be moved into different positions ofadjustment, and is retained in each by a bar T having notches T'engaging a pin T on the lever S.

What I claim as my invention is:

1. In a stoker of the sprinkler type, the combination with a rotaryimpeller, a spill plate on which fuel is deposited and a ram foradvancing fuel on said spill plate; of a rod extending transverselyacross slightly in advance of the forward edge of said spill plate, andmechanism timed with the advancement of said ram for pressing said roddownward to sever the portion of the fuel projected beyond the forwardedge of said spill plate from the following portion.

2. In a stoker of the sprinkler type, the coinhination With a rotaryimpeller, a spill plate on which the fuel is deposited, and a ram forpushing the fuel on said plate beyond the forward edge thereof; of a rodextending transversely across slightly in advance of said forward edgeof the spill plate, and mechanism for vertically reciprocating said rodto successively press downward and break off portions of the fuelprojecting beyond said forward edge.

3. The construction as in claim 2 in which the reciprocating mechanismfor said rod in-' Number cludes vertically extending links at oppositeends of said rod, a rock shaft, rock arms on said rock shaft pivotallyconnected to the upper ends of said links, an actuating rock arm forsaid rock shaft, a continuously rotating shaft, and a rod connected tosaid actuating rock arm and having an eccentric connection to saidrotating shaft.

HERBERT LEONARD WAGNER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Name Date 2,423,110 Mosshart July 1, 1947

